Oven for ranges



Dec. 15, 1931.

c c ARM STRONG OVEN FOR RANGES 5 Sheets-Sheet 2 Filed April 1930 I n veni'o C72 ades C Armiron g,

Dec. 15, 1931. c. c. ARMSTRO G- 1,836,639

. ovEN FOR RANGES Filed April 1930 3 Sheets-Sheet- 3 13 .znuenion Ci: axles CArmsii on Patented Dec. 15, 1931 UNITED STATES PATENT OFFICE CHARLES C. ARMSTRONG, OF HUNTINGTON, WEST VIRGINIA, ASSIGNOR, BY MESNE ASSIGNMENTS, T'O ARMSTRONG DELAWARE APPLIANCEv CORPORATION, A CORPORATION" OF v ovmr FOR RANGES Application filed April 11, 1930. Serial No. 443,482.

My present invention relates to improvements in the construction of ovens and more particularly it relates to ovens of the doublewalled type in which the dead-air spaces are utilized for heat insulation. 7

An object of the invention is to provide a construction enabling the employment of a material for the inner lining or inner wall of the double-walled oven which is not detri-' mentally affected by the combined action of heat, moisture, and the vapors from cooking foods, and is substantially corrosion-proof.

Another object is to provide a novel means of connecting said corrosion-proof material to form the inner lining of the oven and to make the connection sufliciently air-tight for the purpose, without resorting to welding since such material is not readily welded.

A still further object is by the elimination of costly welding operations, to accomplish economy in production and to obtain a. wide choice of non-corrosive materials for the inner lining of the oven.

Other objects will appear hereinafter.

The invention consists in the features and combination and arrangement of parts hereinafter described and particularly pointed out in the claims.

In the drawings Figure 1 is a sectional elevation through the oven embodying the particular construction of my invention.

Fig. 2 is an enlarged view of the connections and structure shown in Fig. 1.

Fig. 3 is a sectional view of the inside oven lining A.

Fig. 4 is a sectional. view of the outside oven lining B as it appears before assembly.

Fig. 5 shows the crosssectional shape of the inside rear end wall D of the oven lining, over which the outside rear end lining E is adapted to be placed.

Fig. 6 shows the cross-sectional construction of the inside liningF for the oven door.

Fig. 7 is a cross-section of the ring C adapted to form the front of the oven and to close the space between the front ends of the inner and outer linings A and Fig. 7 shows the ring C as it appears before assembly.

Fig. 8 is an enlarged detail View of the lock seam used on shells A and B.

' Figs. 9 and 10 are details of the rear corner of the oven lining showing screw connections through E. i

Figs. 11 and 12 respectively show open and closed positions of one die arrangement for forming the crimped edges although it is not desired to limit the invention to this method.

Referring to the drawings, the oven generally comprises the outer casing or housing 2 having top, side, and bottom walls 3, rear wall 4-,and door 5 hinged to the outer casing in the customary manner, not shown as it constitutes no part of the present invention.

.The inside lining or wall F of the oven door is of novel shape to conform to theconstruction of the ring C forming the front of the oven and closing the space between the front ends of the inner and outer oven lining walls A and B.

As shown, the oven lining comprisin the inner and outer lining walls A and ,is spaced from the walls 3 and 4-of'the casing 2 by dead air space 6. The oven lining itself provides a dead air space 7 between its inner and outer lining Walls A and B.

The double Walled oven lining is supported within the oven casing 2 as by bolt 8 at the rear end and by the annular ring or door frame C at the front end.

According to my present invention the construction of the oven lining is eflected without costly welding operation and enables the use of a variety of corrosion-proof materials which are not adapted for welding, as for instance, aluminum, alloys containing aluminum, and materials having like corrosion-proof qualities which may constitute the Walls of the oven lining or which may constitute the outer layers or surfaces of the walls, as where the corrosion-proof material is applied as a coatingto sheets of other material to form the walls.

The double walled oven lining embodying my invention consists of inner and outer lining shells A and B bent to rectangular tubular shape from flat sheets which have had their edges formed as shown and their ends lock-seamed together, as shown in Fig; 8. A

formed ring C closes the space between the two walls or lining shells A and B at the front; a shaped plate D forms the inside back wall of the oven and closes the space between the rear ends of the shells A and B; and an outer back lining wall E is secured in place by screws 9 or the like through the edge thereof on each of the four corners as shown in Figs. 9 and 10.

In Fig. 2 the particular joints embodying my invention are somewhat enlarged in order to clearly illustrate the construction and in the other figures of the drawings the novel construction is also accentuated forthe sake of clearness.

As shown in Figs. 1 and 2 the inside lining A throughout itsrectangular tubular extent is curled at its edges outwardly and back to form hooked and-rolled beads 10 and 11.

The rolled edges or beads 10 and 11 are adapted to be received in correspondingly shaped channels 10a and 11a formed in the inner edge of ring C and in the plate D respectively.

The outside lining shell B as shown in Figs. 1 and 2 is curled outwardly at its forward edge at 12 in interlocking connection with the inwardly curled outer edge 12a of the ring C. At itsrear edge the shell B is bent inwardly at 13 over the rearwardly turned outer edge 13a of the plate D.

The outer lining wall E has its edges bent forwardly to embrace the connection of-B to D and is secured in place by screws 9,0r the like as above mentioned. V

The inner wall or lining F of the oven door is provided with anannular channel or groove 10b to receive 10a and 10 and isshaped to conform snugly to the configuration of the face of the ring C, which forms an abutting frame for said door.

All of the above described joints by reason of their curling and rolling and overlapping interconnection are tight fitting and substantially air tight without requiring expensive welding processes andenabling the use of a wide variety of non-corroding metals or metallic alloys for the lining walls which are not readily welded.

One method of assembling the structure shown in Figs. 1 and 2, and referring to Figs. 11 and 12 by way of illustration, is to place the outer lining B of Fig. 8 in a die andthen place the plate D in position upon B with the flange 13 of B in position to be folded, curled, or crimped over the edge 13a of D, or the plate D may be'placed within the outer lining B and the two put in the die atthe same time. The inner lining A is then placed in position upon D with the curled edge 11 in the channel 11a and the ring C of Fig. 7 is then placed upon the forward or upper edges of A and B. a

Thedie is preferably so arranged that the descending punchthereof curls or crimps the outer edge 12a of ring C over the outwardly turned edge 12 of B, and at the same time the flange 13 of B is folded or crimped over the edge 13a of D. As pressure is applied in this operation the upper and lower rolled edges 10 and 11 of A are forced tightly into the grooves 10a and 11a in C and D.

Since there is no welding between the parts A, B, C, D, E and the door lining F it will be apparent that they all may be made of non-corroding metal or only the innermost lining walls as A, D and the door lining F.

The door lining F is secured to the door by means of bolts or the like 14.

I do not desire to limit my invention to the process of assembly described, as the curling of C over B and the curling of B over may becombined in one die as described orthey maybe performed separately.

One die arrangement for carrying out this method is shown in open and closed positions in Figs. 11 and 12. As is apparent from the illustrations, the first effect of the pressure from the descending upper die X is to force downward the whole assembly and so cause thellower edge of B to be folded over as it is pressed into the groove Y at the bottom of the stationary lower die Z. This having occurred, the punch X, continuing its descent, brings the downward projecting lip of G into contact with the curling radius W of the upper part V of the stationary lower die Z and causes the curl to take place. Slight further movement of the punch serves to compress this curled lip of O tightly in contact withB. The corrosion-proof material formingor surfacing the inner lining shell, inner rear lining wall, and door frame ring, may be provided with a coating. of vitreous enamel, after the assembling has been completed.

I-claim:

1. An oven construction including an oven lining spaced. from the outer oven casing, said lining comprising spaced inner and outer tubular lining shells, an inner rear plate interconnected with the rear ends of the said tubular shells and closing the said ends, an outer rear plate overlying and spaced from the inner rear plate and engaging the interconnected edges of the outer lining shell and the inner rear plate, a door frame ring having edge engagement with the forward ends of said tubular shells and closing the front end of the space between them, and a door adapted to close the front end of the inner lining shell and shaped to conform closely to the contour of the said door frame ring. 2. An oven construction according to claim 1 in'which said parts are united by pressed non welded connections.

8. A lining for ovens comprising spaced apart inner and outer tubular lining shells of rectangular shape, said shells each comprising corrosion-resisting sheet material bent into said rectangular tubular shape and having its ends lock-seamed together, said outer shell extending beyond the inner shell at each end, a dished inner rear lining wall interconnected with and closing the rear ends of said shells, an outer rear plate overlying and spaced from the inner rear plate and engaging the interconnected edges of the outer lining shell and the inner rear plate, and a dished door engaging ring having edge engagement with the forward ends of said tubular shells and closing the front end of the space between them.

4. A construction according to claim 1 in which the edges of said inner tubular shell are curled outwardly to form a rolled bead, said inner rear plate providing a channel to receive the rear bead and said ring providing a channel at its inner edge to receive the front bead, said inner rear plate and said ring each flaring outwardly from its channel to engage the edges of said outer tubular shell, said outer tubular shell having its forward edge turned outwardly and having its rear edge turned inwardly and crimped over the edge of the inner rear plate, the outer edge of said ring being crimped inwardly over the outwardly turned forward edge of the outer tubular shell, and said outer rear plate having a flange at its edge embracing the connection of the inner rear plate to the outer tubular shell, said crimped interlocking connections forming substantially air tight connections and pressing said beads tightly into said channels without welding.

5. An oven construction according to claim 1 in which said parts are unitedby folded, curled and crimped non-welded connections which are substantially air tight.

6. A lining for ovens comprising spaced apart inner and outer tubular lining shells, said inner shell being corrosion resistant, an inner rear lining wall engaging and closing the rear ends of said shells, said inner rear lining wall having an interlocking non-welded connection with said inner shell and having a connection with said outer shell, an outer rear lining wall overlying and spaced from the inner rear wall and engaging the connected edges of the outer shell and inner rear wall, and a door frame ring closing the space between the front ends of said shells, said ring having an interlocking non-welded connection with said inner shell and having a connection with said outer shell.

7. A construction according to claim 6 in which said interlocking non-welded connections comprise rolled beads formed at the front and rear edges of the inner shell, and channels formed in the door frame ring and in the inner rear lining wall, said channels receiving said rolled heads.

8. A construction according toclaim 6 in which said interlocking non-welded connections comprise rolled beads formed at the front and rear edges of the inner shell, and channels formed in the door frame ring and in the inner rear lining wall, said channels receiving said rolled beads, said outer tubular shell having its forward edge turned outwardly and its rear edge turned inwardly and crimped over the edge of the inner rear lining wall, the outer edge of said ring being turned inwardly and crimped over the outwardly turned forward edge of the outer tubular shell, said crimped interlocking connections being substantially air-tight and pressing said beads into air-tight engagement in said channels without welding.

9. A construction according to claim 6 in which said interlocking non-welded connections comprise rolled beads formed at the front and rear edges of the inner shell, and channels formed in the door frame ring and in the inner rear lining wall, said channels receiving said rolled beads, said outer tubular shell having its forward edge turned outwardly and its rear edge turned inwardly and crimped over the edge of the inner rear lining Wall, the outer edge of said ring being turned inwardly and crimped over the outwardly turned forward edge of the outer tubular shell, said crimped interlocking connections being substantially air tight and pressing said beads into air-tightengagement in said channels without welding, said outer rear wall having a flange at its edge embracing the crimped interlocking connection of the inner rear wall to the outer tubular shell, all of said connections being nonwelded and being formed by folding, curling,

or crimping of the sheet material.

10. A lining for ovens comprising spaced apart inner and outer tubular lining shells, an inner rear wall having interlocking, curled, or crimped connections with the rear edges of the inner and outer tubular lining shells, and a door frame ring having interlocking, curled, or crimped connections with the front edges of the inner and outer tubular shells.

11. A construction according to claim 10 in which said curled or crimped connections to the inner shell are non-welded, said inner shell being corrosion resistant.

12. A construction according to claim 10 1 in which said curled or crimped connections are non-welded, said inner and outer shells being corrosion resistant.

13. A construction according to claim 10 in which said outer rear wall is provided with a flange embracing the curled or crimped conllliection of the outer shell to the inner rear wa In testimony whereof, I aflix my signature.

CHARLES C. ARMSTRONG. 

